What was found
ON DESCENT, FLIGHT ATTEMPTED TO LOWER GEAR, BUT RECEIVED 3 RED LIGHTS. FLIGHT EXECUTED A FLY-BY & DECLARED AN EMERGENCY. CREW USED ALTERNATE GEAR EXTENSION PROCEDURES & LOWERED GEAR. FLIGHT LANDED SAFELY. ACCOMPLISHED NON-RII INSPECTION OF AMIS ITEM 5102002, TROUBLESHOT SYS IAW TS M32-31-00. FOUND LG SELECTOR VLV TO BE FAILED. R & R LG SELECTOR VLV IAW AMM 32-31-12. SYS CHECKED GOOD, GEAR SWING SUCCESSFUL IAW AMM 32-31-30. LEAK CHECKED GOOD, OK TO CONTINUE. COMPLIED WITH IDT INSP.